Tiny cluster of white orbs one by one quickly appearing a disappearing. So close together it may have looked like one object at a glanc

I was looking out my office window towards four peaks as something caught my eye, I thought it was a firework at first but upon a closer look it was not. A small cluster of white orbs appearred rapidly one by one. There was probably about 10-15 of them but they were so close together it may have looked like one object at a glace. They stayed lit for about 4 seconds and just as quick as they appeared, one by one they disappeared. The whole thing lasted probably 7-8 seconds. I quickly told my collegues (who thought I was crazy) We watched the same area and about 2 minutes later the same thing appeared in the sky about 20-30 miles North of four peaks this time and much higher. They were just as baffled as me. None of us had ever seen anything like that in the sky before